Dials, Automatic No. 21
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DIALS, AUTOMATIC No. 21
Dials, Automatic Nos. 13 to 20 inclusive will continue to be available until superseding types are announced.
The Dial, Automatic, No. 21LA, Black is identical with the Dial, Automatic, No. 21CA, Black except that it has a Label No. 389 (number ring with letters and figures) instead of a Label No. 386, Black.
Note: green and grey Labels No. 388, which are darker than the green and grey finger plates, match the colour o the telephone handsets; the finger plates match the colour of the telephone covers.
Removal of label protector
The easiest method of removal is to use an Extractor No. 29 which is a rubber suction disk with a finger grip. This item [Small Stores, Rate Book Section 5 (T-B)] should be requisitioned from the Supplies Dept. and issued from Section Stock one to each installation and maintenance officer concerned. Unit of issue from the Supplies Dept. is 50. The Extractor No. 29 can be released from the label Protector by lifting one edge of the rubber with the finger nail.
An alternative method of removing the label protector is to insert a Screwdriver No. 1 radially between the finger plate and the number ring at the 13 o'clock position on the dial. The screwdriver will then enter a slot in the finger plate and, by turning the screwdriver beneath the pip in a thin metal plate which is under the label protector, the protector will be ejected. Care must be taken to ensure that the end of the screwdriver is under the metal plate and not between the plate and the label protector. It is advisable to hold two fingers over the protector to restrain it during ejection. It is always advisable when replacing the protector to locate it so that its three Dips are clear of the slot provided for the screwdriver, otherwise subsequent removal might prove difficult.
Dial centre labels
Label No. 386A is for use in automatic areas with "999" facilities. Label No. 386B is for use in automatic areas with "0" facilities. When putting the label into the dial, care should be taken to ensure that its centre line is horizontal.
If delay in receiving Labels No. 366... should prejudice the installation of Telephones No. 706 or 710 fitted with Dials, Automatic, No. 21CA, Labels No. 160... may be used. The appropriate Label No. 160 ... should continue to be used for installations where Labels No. 386A-B are unsuitable. Care should be taken to fit the labels with the printing horizontal.
Finger stop - Part No. 1/DST/19 (Stop, finger)
Label protector - Part No. 1/DPR/5 (Protector, label)
Finger plate - Part No. 1/DPL/2018 (colour) (Plate, finger)
Retaining spring - Part No. 1/DSP/1482 (Spring, retaining, label) for number ring
Number ring - Label No. 368 (colour) or Label No. 389.
A1 Pulse Wheel - Part No. 1/DWH/38 (non-replaceable in the field)
NOTE:- on 700-type telephones the dial cord is provided with spade tags so that it is necessary only to loosen the dial screws to release the cord. Spade tags are also being introduced on other dial cords.
If it becomes necessary to change a Dial, Automatic, No. 21... at a subscribers' premises and a new dial of the correct colour is not readily available, it will generally be possible to use the mechanism of a new Dial, Automatic, No. 21... of another colour, together with the coloured parts of the old dial, provided the latter are in good condition.
As the finger plate was moulded in one piece there was no slot provided in which to insert a screwdriver, to remove the label cover. A rubber extractor was introduced called an "Extractor No. 29" which effectively was a rubber sucker. Selotape stuck firmly to the cover and then pulled sharply away from the dial will also normally remove the label cover.
Dial Fingerplate Labels
Last revised: January 08, 2022